<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">

    <div class="topText">
      <div class="img">
        <img src="https://i.loli.net/2021/12/02/hqUwB432HW1FZJA.png" width="30px" height="30px" style="margin-top: 5px">
        万物互联！生生不息！物联网未来会统治世界么？
      </div>

    </div>
<!--    <transition-group name="breadcrumb">-->
<!--      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">-->
<!--        <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">-->
<!--          {{ generateTitle(item.meta.title) }}-->
<!--        </span>-->
<!--        <a v-else @click.prevent="handleLink(item)">{{ generateTitle(item.meta.title) }}</a>-->
<!--      </el-breadcrumb-item>-->
<!--    </transition-group>-->
  </el-breadcrumb>
</template>

<script>
import { generateTitle } from '@/utils/i18n'
import pathToRegexp from 'path-to-regexp'

export default {
  data() {
    return {
      levelList: null
    }
  },
  watch: {
    $route(route) {
      // if you go to the redirect page, do not update the breadcrumbs
      if (route.path.startsWith('/redirect/')) {
        return
      }
      this.getBreadcrumb()
    }
  },
  created() {
    this.getBreadcrumb()
  },
  methods: {
    generateTitle,
    getBreadcrumb() {
      // only show routes with meta.title
      let matched = this.$route.matched.filter(item => item.meta && item.meta.title)
      const first = matched[0]

      if (!this.isDashboard(first)) {
        matched = [{ path: '/dashboard', meta: { title: 'dashboard' }}].concat(matched)
      }

      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
    },
    isDashboard(route) {
      const name = route && route.name
      if (!name) {
        return false
      }
      return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
    },
    pathCompile(path) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink(item) {
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
.topText {
  color: #42b983;
  font-family: "Lucida Console", "Courier New", monospace;
  font-style: italic;
  font-weight: bold;
  font-size: 1.5em;
}
</style>
